Groove Acts As Control System Signal Patents (Class 369/278)
  • Patent number: 8717858
    Abstract: An embodiment of the invention, to provide a recording method and a storage medium for BCA data with high reliability for a storage medium and a method for reproducing BCA data from the storage medium, and an information recording apparatus and an information reproducing apparatus. In a conventional optical disk, low reliability data is recorded in a data area of BCA. Thus, the thickness of a film material for use in a recording layer oriented to BCA data or close to the inner periphery of the storage medium in the vicinity thereof is formed in uniform thickness by using a substrate of the storage medium, the substrate being formed by being suctioned by means of adsorbing mechanisms formed in an arc shape so as to integrated two of the adsorbing mechanisms to be adjacent to each other.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: May 6, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Takazawa, Seiji Morita, Yasuaki Ootera, Hideo Ando, Naoki Morishita, Kazuyo Umezawa
  • Patent number: 8472291
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: June 25, 2013
    Assignee: Panasonic Corporation
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Patent number: 8427932
    Abstract: Efficient recording and reading are achieved in an optical recording medium including servo layers and recording and reading layers. The optical recording medium includes: a first servo layer having a projection and a depression for tracking control that are formed in a first spiral direction; a second servo layer having a projection and a depression for tracking control that are formed in a second spiral direction opposite to the first spiral direction; and a plurality of recording and reading layers having a flat structure with no projection and depression for tracking control. Information is recorded on each of the plurality of recording and reading layers while tracking control is performed using the first servo layer or the second servo layer.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: April 23, 2013
    Assignee: TDK Corporation
    Inventors: Motohiro Inoue, Takashi Kikukawa, Atsuko Kosuda, Hideki Hirata
  • Patent number: 8111604
    Abstract: A fabrication method of a multilayer optical recording medium having a plurality of recording layers, comprises a step of preparing an optical recording medium having at least one record area; a write-position mark generating step of recording write-position marks in the record area beforehand; a step of preparing an optical system including a common objective lens to focus a data recording beam and a position mark recording beam on different positions in a thickness direction of the record area; a first data writing step of writing data between the write-position marks with following the write-position marks by the data recording beam; a position mark recording step of, in parallel with the first data writing step, recording new write-position marks in the record area by the position mark recording beam; and a second data writing step of writing data between the new write-position marks with following the new write-position marks by the data recording beam.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: February 7, 2012
    Assignee: Pioneer Corporation
    Inventors: Masaharu Nakano, Masakazu Ogasawara, Makoto Sato
  • Publication number: 20110205870
    Abstract: An optical recording medium including recording and reading layers and a servo layer increases the recording capacity thereof. In the optical recording medium including the plurality of recording and reading layers and the servo layer, the servo layer has a groove and a land that can be used to perform tracking control with a long-wavelength servo beam. Information is recorded on the recording and reading layers with a recording and reading beam having a wavelength shorter than the wavelength of the servo beam. Recording marks are formed on the recording and reading layers while both the groove and land are tracked.
    Type: Application
    Filed: February 22, 2011
    Publication date: August 25, 2011
    Inventors: Atsuko Kosuda, Motohiro Inoue, Takashi Kikukawa, Hideki Hirata
  • Patent number: 7876668
    Abstract: An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: January 25, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Du-seop Yoon, Kyung-geun Lee, Byoung-ho Choi, Jae-seong Shim
  • Patent number: 7830768
    Abstract: A high-density read-only optical disc, and an optical disc apparatus and method using the same. The apparatus and method record data on a lead-in area of a high-density read-only optical disc such as a BD-ROM (Blu-ray disc ROM (Read Only Memory)) in the form of pre-pit strings associated with an HFM (High-Frequency Modulated) groove applied to a BD-RW (Blu-ray Disc Rewritable). Moreover, the apparatus and method continuously apply the same tracking servo operation to an entire area of the same high-density read-only optical disc or rewritable optical disc. Therefore, the apparatus and method can simplify an algorithm for controlling a plurality of tracking servo operations, and avoid an increased size of the optical disc apparatus.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: November 9, 2010
    Assignee: LG Electronics Inc.
    Inventors: Jin Yong Kim, Sang Woon Suh, Kyung Chan Park, Yun Sup Shin
  • Patent number: 7801006
    Abstract: A high-density read-only optical disc, and an optical disc apparatus and method using the same. The apparatus and method record data on a lead-in area of a high-density read-only optical disc such as a BD-ROM (Blu-ray disc ROM (Read Only Memory)) in the form of pre-pit strings associated with an HFM (High-Frequency Modulated) groove applied to a BD-RW (Blu-ray Disc Rewritable). Moreover, the apparatus and method continuously apply the same tracking servo operation to an entire area of the same high-density read-only optical disc or rewritable optical disc. Therefore, the apparatus and method can simplify an algorithm for controlling a plurality of tracking servo operations, and avoid an increased size of the optical disc apparatus.
    Type: Grant
    Filed: April 30, 2003
    Date of Patent: September 21, 2010
    Assignee: LG Electronics, Inc.
    Inventors: Jin Yong Kim, Sang Woon Suh, Kyung Chan Park, Yun Sup Shin
  • Patent number: 7746757
    Abstract: Provided are a medium structure which allows track narrowing onto a three-dimensional pit selection type disc, and its corresponding optical disc device. Multiple data pit strings are formed between track guide grooves, and a phase-change recording film is formed only in the data pit strings. Thereby, a disc configuration is achieved. Reflectivity and a phase of each of a space portion and a mark portion are appropriately set. Thereby, normal resolution signal cancel is implemented to prevent deterioration in data crosstalk and a push-pull signal. An optical disc medium of the present invention is supported by an optical disc device having a configuration in which a signal is selected from a push-pull signal of a main beam and push-pull signals of sub-beams to read out wobble address information.
    Type: Grant
    Filed: February 12, 2007
    Date of Patent: June 29, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Minemura, Toshimichi Shintani, Yumiko Anzai
  • Patent number: 7619950
    Abstract: A recording medium, such as a high-density and/or read-only recording medium, such as BD-ROM, which includes copy protection information for preventing illegal copying of the contents recorded on the recording medium, and to methods and apparatuses for forming, recording, and reproducing data on the recording medium.
    Type: Grant
    Filed: May 20, 2004
    Date of Patent: November 17, 2009
    Assignee: LG Electronics Inc.
    Inventors: Jin Yong Kim, Jung Bae Park
  • Patent number: 7561496
    Abstract: A recording medium, such as a high-density and/or read-only recording medium, such as BD-ROM, which includes copy protection information for preventing illegal copying of the contents recorded on the recording medium, and to methods and apparatuses for forming, recording, and reproducing data on the recording medium.
    Type: Grant
    Filed: May 20, 2004
    Date of Patent: July 14, 2009
    Assignee: LG Electronics Inc.
    Inventors: Jin Yong Kim, Jung Bae Park
  • Patent number: 7540006
    Abstract: An optical information recording medium includes one or more information layers including a recording layer for recording/reproducing an information signal by irradiation with a laser light, and a seperating layer or a protective substate on which a first information layer of the information layer on the irradiation face side is formed. The seperating layer or the protective substrate having a guide groove spirally or concentrically formed on the surface, and the respective inclined planes on the inner perimeter side and the outer perimeter side of the guide groove having inclined angles ? and ? with respect to the bottom face of the guide groove. The guide groove has one or more dissymmetric regions in the radius direction where the inclined angles ? and ? are different. The information layer has roughly agreeing thicknesses in the inclined face portion on the inner and outer perimeter sides in the dissymmetric region.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: May 26, 2009
    Assignee: Panasonic Corporation
    Inventors: Ken'ichi Nagata, Kenichi Nishiuchi, Hideki Kitaura, Hideo Kusada, Noboru Yamada, Shinya Abe
  • Patent number: 7520001
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: April 14, 2009
    Assignee: Panasonic Corporation
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Publication number: 20090003170
    Abstract: A recording medium includes first information selected from a plurality of information patterns and second information selected from another plurality of information patterns for the true-false judgement. A true-false judging device performs a statistic analysis when any coincidence is found between the readout combination of the first and second information and registered combination patterns, to identify an inspected recording medium as a forged product based on the result of the statistic analysis.
    Type: Application
    Filed: July 1, 2008
    Publication date: January 1, 2009
    Applicant: Victor Company of Japan, Ltd.
    Inventor: Tetsuya Kondo
  • Patent number: 7430160
    Abstract: An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
    Type: Grant
    Filed: April 21, 2006
    Date of Patent: September 30, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Du-seop Yoon, Kyung-geun Lee, Byoung-ho Choi, Jae-seong Shim
  • Patent number: 7366084
    Abstract: An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: April 29, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Du-seop Yoon, Kyung-geun Lee, Byoung-ho Choi, Jae-seong Shim
  • Patent number: 7274651
    Abstract: An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: September 25, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Du-seop Yoon, Kyung-geun Lee, Byoung-ho Choi, Jae-seong Shim
  • Patent number: 7110544
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: September 19, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Patent number: 7103781
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: September 5, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Patent number: 6772429
    Abstract: An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: August 3, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Du-seop Yoon, Kyung-geun Lee, Byoung-ho Choi, Jae-seong Shim
  • Patent number: 6620480
    Abstract: The invention concerns a pre-engraved substrate for a memory disc recordable by magnetic, magneto-optical or phase transition constraint, its manufacturing method and the resulting disc. Said pre-engraved substrate comprises a support (1) having at its surface a surface film (2) in a reflecting material and enabling to obtain a surface with optical polish and at least a recordable film (4), the surface film (2) and the film (4) comprising a succession of microgrooves and/or pits (7) representing a pre-formatting signal, the walls (8) of said pits and/or microgrooves (7) being formed in such of films (2) and (4) of the material constituting said film. The invention is useful for making magnetic, magneto-optical and phase transition optical discs, used particularly in the field of computers.
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: September 16, 2003
    Assignee: O.D.M.E. International B.V.
    Inventor: Jean Ledieu
  • Publication number: 20020159354
    Abstract: When the temperature of an SPM (spindle motor), measured by a temperature sensor, falls outside a predetermined temperature range, a CPU in a disk drive sets, in a disk controller, information concerning the activation of the SPM, to enable a host system to acquire the information. The information includes a temperature control request used to cause the temperature of the SPM to fall within the predetermined temperature range, the present temperature of the SPM and a waiting time required for the SPM to become activatable as a result of temperature control by the host system.
    Type: Application
    Filed: March 7, 2002
    Publication date: October 31, 2002
    Inventor: Yoichi Nakabayashi
  • Patent number: 6341121
    Abstract: In a recording apparatus, a pit gain selection circuit 33 converts an amplitude proportional to pit length data into gain data, and outputs the gain data to a pit cutting signal generation circuit 39 via a timing adjustment circuit 35. The generation circuit 39 selects gain data proportional to each pulse duration of a pit signal and converts it into an analog signal. A groove correction value selection circuit 41 converts the analog signal into a groove correction value on the basis of the pit length data, and outputs the groove correction value to a groove correction signal generation circuit 47 via a timing adjustment circuit 45. The generation circuit 47 calculates a magnitude of groove signal correction, converts it into an analog signal, and outputs it to a subtractor 51. The subtractor 51 subtracts the analog signal from this analog signal.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: January 22, 2002
    Assignee: Seiko Epson Corporation
    Inventor: Hideaki Yamada
  • Patent number: 6249507
    Abstract: Storage density in an optical data storage media and system is increased many times the resolution limit by fully utilizing the much smaller detection limit by differentiating and isolating the active data sites in the media optically. The tracks are preordained and predisposed to a specific optical property and value that is different from that of its “n” nearest neighbors but is identical to its nth neighbor and to the optical properties of the reading and writing optical system.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: June 19, 2001
    Inventor: John M. Guerra
  • Patent number: 6118756
    Abstract: A recording medium of one-side address method capable of easily detecting a synchronous signal and production method of recording medium master used for such a recording medium. The recording medium master production method includes a photo-sensitive layer exposure step using a first beam and a second beam for exposure of walls of a groove in a straight line, wherein for exposure of an area where a synchronous signal is to be recorded, the second beam alone is used while being wobbled according to the synchronous signal. Moreover, the recording medium according to the present invention has at least a groove formed on a recording plane including: an area having no synchronous signal recorded where one of the walls of the groove is formed straight and the other wall of the groove is at least partially meandered according to an address signal; and an area having a synchronous signal recorded where both of the walls of the groove are meandered according to the synchronous signal.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: September 12, 2000
    Assignee: Sony Corporation
    Inventors: Shin Masuhara, Masanobu Yamamoto
  • Patent number: 5989671
    Abstract: An optical tape including an optical recording layer for permitting information to be optically recorded thereon and a light-reflective magnetic layer. The light-reflective magnetic layer which reflects light projected onto the recording layer, also permits magnetic recording or magneto-optical recording to be performed thereon, thereby increasing a storage capacity of the optical tape remarkably. Further, the optical tape is provided with a layer to form guiding grooves for tracking control. The layer to form guiding grooves is made up of ultraviolet-hardening resin, photo-resist, or a photochromic material. For example, in the case of using ultraviolet-hardening resin, after a guiding groove pattern has been exposed by projecting an ultraviolet ray on a layer made up of ultraviolet-hardening resin, the exposed areas harden to form areas corresponding to guiding grooves between those exposed areas.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: November 23, 1999
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Junichiro Nakayama, Hiroyuki Katayama, Akira Takahashi, Kenji Ohta, Kazuo Van
  • Patent number: 5959960
    Abstract: A method of coating an optical recording layer on a transparent grooved substrate is disclosed. The recording layer is coated from a mixture of a primary and a secondary solvent. The solvent mixture provides a wide range of conformalities for optical recording layers.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: September 28, 1999
    Assignee: Eastman Kodak Company
    Inventors: Susan Starr Collier, Michael Paul Cunningham, Csaba Andras Kovacs
  • Patent number: 5852599
    Abstract: A magneto-optical disk 1 has a track, wherein one of the sidewalls (sidewall 4) of a groove 2 is wobbled by a wobble signal, and is provided with a notch 5 in the track having a different frequency from the wobble signal. The absolute position of the magneto-optical disk 1 is detected with a sample bit stored by the notch 5 of the track, and an information bit is stored with a recording/reproducing clock synchronizing with that position. By forming the notch 5 in this manner, information can always be recorded at the same information bit position, regardless of how many times information is rewritten. Therefore, a gap area and a buffer area, which have conventionally been essential, are not needed on the optical disk. Consequently, it is possible to use a recording area effectively.
    Type: Grant
    Filed: January 22, 1997
    Date of Patent: December 22, 1998
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Hiroshi Fuji
  • Patent number: 5689496
    Abstract: An optical recording medium enables an optical pickup to quickly access a plurality of items of information progressing concurrently or to be selected simultaneously. By provision of spiral multitrack formed by multiple winding of a plurality of tracks in a first recording region and concentric-circle track formed in a second recording region adjacent to the first recording region, this invention can implement an optical recording medium in which the distance from the concentric-circle track to each track of the spiral multitrack is shortened, thus enabling an optical pickup to quickly access a desired track at a track jump.
    Type: Grant
    Filed: September 17, 1996
    Date of Patent: November 18, 1997
    Assignee: Sony Corporation
    Inventor: Kenichi Amano
  • Patent number: 5682375
    Abstract: Disclosed herein is an information recording medium to be illuminated with an optical radiation beam, comprising a substrate having a surface provided with a preformat comprising a servo track and forming a sectional shape, in transverse to the track, which comprises a concavity provided between two convexities, each having a flat top, and a light reflecting layer being formed by application of a coating liquid over the surface of the substrate, wherein the concavity has the sectional shape of an open trapezoid having a rectangular part, the trapezoidal part has a pair of parallel opposite sides and a pair of sloping sides constituting walls of the trapezoidal part, one of the parallel sides constituting the bottom of the trapezoidal part being shorter than the opposite side, and the rectangular part is adjacent to the side constituting the bottom of the trapezoidal part.
    Type: Grant
    Filed: July 24, 1995
    Date of Patent: October 28, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Imataki
  • Patent number: 5582891
    Abstract: A method of making a stamper uses a photoresist disk cut by the application of a laser beam on the land planes thereof, or a stamper which is different in depth between the land plane on the internal peripheral side with respect to the prepit portion and the land plane on the external peripheral side. A method of making an optical disk substrate includes the steps of using a stamper, and molding a transparent plastic material with an injection molding method. A stamper capable of sufficiently transferring the prepits and guide grooves on the optical disk substrate with the correction of right and left inequality of the prepits, and the method of making it, and a superior optical disk substrate and a method of making it can be realized.
    Type: Grant
    Filed: June 15, 1993
    Date of Patent: December 10, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Motoyoshi Murakami, Masahiro Birukawa, Yoshihiko Kudoh
  • Patent number: 5463614
    Abstract: A writable optical disk with meandering guide grooves is so arranged that a ratio of "track pitch/meander amplitude" is not less than a certain value, for example 57, at least in an out-of-phase portion in which meander of the meandering guide grooves is out of phase on mutually adjacent tracks. Also, the track pitch in the out-of-phase portion is larger than that in an in-phase portion in which meander of the guide grooves is in phase on mutually adjacent tracks.
    Type: Grant
    Filed: September 15, 1993
    Date of Patent: October 31, 1995
    Assignee: Nikon Corporation
    Inventor: Seiji Morita
  • Patent number: 5452284
    Abstract: Both concave and convex portions formed spirally or concentrically on an optical information recording medium are used as recording tracks, in which identification signals including position information on the optical information recording medium and so on are recorded in advance, and information signals are recorded by use of the change of a local optical constant or a physical shape caused by radiating a light beam. The identification signals are disposed in recording tracks of the concave portions, and shifted before and behind in the track direction so as not to be adjacent to each other in the radial direction.
    Type: Grant
    Filed: September 13, 1993
    Date of Patent: September 19, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Naoyasu Miyagawa, Yasuhiro Gotoh
  • Patent number: 5386411
    Abstract: Information is optically recorded to a recordable optical disk by a light beam, and a return light is received from the recordable optical disk to produce a tracking error signal. The recordable optical disk includes: a substrate having a disk shape; a groove formed on a surface of the substrate along a predetermined track which the light beam is made to follow; and a recording layer formed on the surface of the substrate, to which the information is recorded by the light beam. A depth of the groove is prescribed such that an amount of the return light from the groove becomes smaller than an amount of the return light from the portion of the recording layer other than the groove in a condition after recording.
    Type: Grant
    Filed: November 18, 1993
    Date of Patent: January 31, 1995
    Assignee: Pioneer Electronic Corporation
    Inventors: Shuichi Yanagisawa, Satoru Tanaka, Fumio Matsui
  • Patent number: 5377178
    Abstract: A data recording/reproduction method and apparatus uses an optical disk equipped with wobbling track guide grooves disposed in a track scanning direction and minutely wobbled. The apparatus uses a circuit for detecting and correcting displacement of an optical spot position from the wobbling track, and a system for allowing data to correspond to front and rear edges of recording pits as a recording system, and includes a circuit for independently handling reproduction pulses obtained from reproduction signals of the recording pits on the front and rear edge sides and for generating reproduction clocks. A circuit resynthesizes the two series of reproduction pulse trains by a specific pattern portion in the data. Another optical disk apparatus divides each track into zones, and switches a rate of revolution each zone to attain a substantially equal linear velocity. A servo signal reproduction clock generation circuit and a data signal recording/reproduction clock generation circuit are disposed separately.
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: December 27, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Atsushi Saito, Takeshi Maeda, Takeshi Nakao, Kiyoshi Matsumoto, Atsushi Saito, Hiroyuki Minemura, Tetsuya Fushimi
  • Patent number: 5339301
    Abstract: A record carrier on which information may be optically recorded and/or read, having a disc-shaped substrate with a spiral or concentric pattern of preformed tracks thereon and a radiation-sensitive layer extending over such track pattern. The tracks are in the form of ridges of substantially constant width and having a periodic radial wobble of a substantially constant mean frequency, which frequency is modulated by a position-information signal identifying the relative positions of the tracks in the track pattern. Apparatus for forming such a track pattern includes means for modulating the radial track wobble in accordance with the position-information signal.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: August 16, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Wilhelmus P. M. Raaymakers, Franciscus L. J. M. Kuijpers, Aartje W. Veenis, Johannes H. T. Pasman, Hendricus A. M. Mulder
  • Patent number: 5216664
    Abstract: A transparent substrate has an information layer on an entirely flat side, and a centering member on the other side adapted to cooperate with centering means of an apparatus for inscribing and/or reading the disc. The centering member may be glued in place and have an aperture for engagement by an apparatus spindle.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: June 1, 1993
    Assignee: U.S. Philips Corporation
    Inventors: Franciscus T. Sleegers, Pieter D. Schuitmaker, Peter J. M. Janssen
  • Patent number: 5212682
    Abstract: A write once-type recording medium with a guide groove has a first management data for constantly managing a position of a track in the groove after data-writing/reading is excuted and a second management data for managing the data-writing, both optically recorded on a position in the groove displaced from that position.
    Type: Grant
    Filed: December 26, 1990
    Date of Patent: May 18, 1993
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Yukimitsu Sakurai
  • Patent number: 5210738
    Abstract: An optical information recording medium, such as an optical disk, includes a meandering guide groove being varied in period according to first additional information and in amplitude according to second additional information. The optical information recording medium enables recording a plurality of kinds of information in addition to the first and second additional information in accordance with a multiple recording system.
    Type: Grant
    Filed: April 11, 1991
    Date of Patent: May 11, 1993
    Assignees: Pioneer Electronic Corporation, Pioneer Video Corporation
    Inventors: Hiroki Iwata, Yutaka Murakami
  • Patent number: 5170390
    Abstract: An optical recording element comprising a recording medium which includes an information recording area formed at every unit in a non-continuous condition, the recording medium further including sample pits disposed at intervals of a fixed distance for providing basic information about the locations of recording units in the same track. Each sample pit comprises a plurality of pits disposed next to the sequence of the recording units so that the spacing between the pits differs from the spacing between the recording units. At least one of the plurality of pits is a long-sized inclined pit which is inclined at an angle in the range of 6.degree. to 80.degree. to a recording track.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: December 8, 1992
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kenji Ohta, Tetsuya Inui, Hiroyuki Katayama, Akira Takahashi, Junji Hirokane, Yukinori Nishitani, Michinobu Mieda, Kazuo Van
  • Patent number: 5144552
    Abstract: An optical information storage medium is used for recording optical information therein and reproducing optical information therefrom. The optical information storage medium includes parallel, concentric, or helical tracking guide grooves and information tracks defined between the tracking guide grooves. A preformat area composed of discrete pits is disposed on some of the information tracks. The tracking guide grooves and the preformat pits are defined in one surface of a transparent substrate, and a recording film capable of absorbing and reflecting light is disposed on said one surface of the transparent substrate. The ratio of the effective depth of the tracking guide grooves to the wavelength of a recording/reproducing laser beam within the transparent substrate is in a certain range, and the ratio of the effective depth of the preformat pits to the wavelength of the recording/reproducing laser beam within the transparent substrate is also in a certain range.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: September 1, 1992
    Assignee: Ricoh Company, Ltd.
    Inventor: Michiharu Abe
  • Patent number: 5084860
    Abstract: A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of the record carrier so that a plurality of revolutions of the guide groove are spaced apart from each other in radial directions of the record carrier, and a pit pattern provided between adjacent guide grooves, at positions arranged at intervals in the above rotational direction, for detecting the deviation of a light spot from the center line between adjacent guide grooves. The recording/reproducing operation for this record carrier is performed in such a manner that the first tracking error signal is detected from diffracted light from the guide groove, the second tracking error signal is detected from the pit pattern, and information is recorded in and reproduced from a land formed between adjacent guide grooves in a state that a tracking operation is performed using the first and second tracking error signals.
    Type: Grant
    Filed: July 11, 1990
    Date of Patent: January 28, 1992
    Assignee: Hitachi Ltd.
    Inventors: Takeshi Maeda, Yoshito Tsunoda, Kazuo Shigematsu, Toshimitsu Kaku
  • Patent number: 5084856
    Abstract: A cutting apparatus is provided, in which a recording laser beam from a laser light source is ON/OFF-modulated by an optical modulating device on the basis of a square output signal in which a video FM wave signal is pulse width modulated by an audio FM wave signal thereby to form exposure pits on a master disc. This cutting apparatus includes a photodetector for receiving one portion of the recording laser beam irradiated on the master disc from the laser light source or a photodetector for receiving a reflected light of the recording laser beam irradiated on the master disc from the laser light source and which is reflected on the master disc. A detected output signal from the photodetector is supplied through a low-pass filter to a control circuit which controls an intensity of an output laser beam from the laser light source, and an offset of a source system line is adjusted so that a secondary higher harmonic component of a main carrier in the detected output from the photodetector is minimized.
    Type: Grant
    Filed: August 23, 1990
    Date of Patent: January 28, 1992
    Assignee: Sony Corporation
    Inventors: Fumiaki Henmi, Koichi Nakajima
  • Patent number: 5040165
    Abstract: An optical information recording medium in which pre-pits longer than the diameter of a reproducing radiation spot and pre-pits shorter than the diameter of the reproducing radiation spot coexist, the width W of the pre-pit longer than the diameter of the reproducing radiation spot being formed with a value satisfying a relation of .PHI./4<W<.PHI./3, wherein .PHI.
    Type: Grant
    Filed: March 2, 1989
    Date of Patent: August 13, 1991
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Toshiaki Taii, Hiroshi Nagate, Toyoyuki Nunomura
  • Patent number: 4954380
    Abstract: An optical recording medium comprises an optical recording layer on a transparent substrate. The optical recording layer is then selectively irradiated with an energy beam to form therein a tracking region for guiding a laser beam for recording and reproduction. The tracking region is free of unevenness and has an optical characteristic different from that of the portion of the optical recording constituting a data recording region which has not been irradiated with the laser beam.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: September 4, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Osamu Kanome, Takayoshi Tsutsumi
  • Patent number: 4949331
    Abstract: A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of the record carrier so that a plurality of revolutions of the guide groove are spaced apart from each other in radial directions of the record carrier, and a pit pattern provided between adjacent guide grooves, at positions arranged at intervals in the above rotational direction, for detecting the deviation of a light spot from the center line between adjacent guide grooves. The recording/reproducing operation for this record carrier is performed in such a manner that the first tracking error signal is detected from diffracted light from the guide groove, the second tracking error signal is detected from the pit pattern, and information is recorded in and reproduced from a land formed between adjacent guide grooves in a state that a tracking operation is performed using the first and second tracking error signals.
    Type: Grant
    Filed: June 17, 1986
    Date of Patent: August 14, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Maeda, Yoshito Tsunoda, Kazuo Shigematsu, Toshimitsu Kaku
  • Patent number: 4872156
    Abstract: A record carrier is described for optically writing and reading information, which record carrier is provided with a pre-formed track. This track is formed by a ridge disposedon the substrate surface and the recording layer comprises a dye layer having such a thickness at the location of the ridge that a write beam can produce a maximum optical effect therein, the dye layer being thicker at locations outside the ridge.
    Type: Grant
    Filed: February 8, 1989
    Date of Patent: October 3, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Christiaan Steenbergen, Dirk J. Gravesteijn
  • Patent number: 4855991
    Abstract: An optical disk having a disk-like substrate and a recording layer provided on the substrate. First and second regions are alternately arranged along a rotational direction of the optical disk. The first region includes a pre-formed optically detectable portion having an address area, and the second region has a guide groove serving as an optical guide for a light spot. A track offset detection area is provided for detecting track offset due to inclination of the optical disk and is disposed with respect to the first region and the second region so that the light spot is not affected by the first region and the second region. The track offset detection area is preferably a mirror portion disposed between the first region and the second region.
    Type: Grant
    Filed: February 3, 1987
    Date of Patent: August 8, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Toshimitsu Kaku, Yoshito Tsunoda, Takeshi Maeda, Shigeru Nakamura
  • Patent number: RE42162
    Abstract: An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: February 22, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Du-seop Yoon, Kyung-geun Lee, Byoung-ho Choi, Jae-seong Shim
  • Patent number: RE44168
    Abstract: An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: April 23, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Du-seop Yoon, Kyung-geun Lee, Byoung-ho Choi, Jae-seong Shim